LT4275

RECOMMENDED FOR NEW DESIGNS

LTPoE++/PoE+/PoE PD Controller

Data Sheet Product Selection Table
Part Models
24
1ku List Price
Starting From $1.12
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Part Details

  • IEEE 802.3af/at and LTPoE++™ Powered Device (PD) Controller
  • LTPoE++ Supports Power Levels Up to 90W
  • LT4275A Supports All of the Following Standards:
    • LTPoE++ 38.7W, 52.7W, 70W and 90W
    • IEEE 802.3at 25.5W Compliant
    • IEEE 802.3af Up to 13W Compliant
  • LT4275B is IEEE 802.3at/af Compliant
  • LT4275C is IEEE 802.3af Compliant
  • 100V Absolute Maximum Input Voltage
  • Wide Junction Temperature Range (–40°C to 125°C)
  • Overtemperature Protection
  • Integrated Signature Resistor
  • External Hot Swap™ N-Channel MOSFET for Lowest Power Dissipation and Highest System Efficiency
  • Programmable Aux Power Support as Low as 9V
  • Optional Support of Non-Standard Low Voltage PoE
  • Available in 10-Lead MSOP and 3mm × 3mm DFN Packages
LT4275
LTPoE++/PoE+/PoE PD Controller
LTPoE++ 90W Powered Device Interface Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 2

User Guide 2

Design Note 1

Technical Articles 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Hardware Ecosystem

Parts Product Life Cycle Description
Analog Temperature Sensors 1
LTC2997
PRODUCTION Remote/Internal Temperature Sensor
Ideal Diode Bridge 1
LT4320
LT4320-1
Ideal Diode Bridge Controller
PoE Power Sourcing Equipment (PSE) 2
LTC4270
RECOMMENDED FOR NEW DESIGNS 12-Port PoE/PoE+/LTPoE++ PSE Analog Controller
LTC4266A
LTC4266C
Quad PoE/PoE+/LTPoE++ PSE Controller
PoE Powered Device (PD) 1
LT4276
RECOMMENDED FOR NEW DESIGNS LTPoE++/PoE+/PoE PD Forward/Flyback Controller
Power Monitors 1
LT2940
PRODUCTION Power and Current Monitor
PowerPath, Ideal Diodes, and Load Switches 1
LT4321
RECOMMENDED FOR NEW DESIGNS PoE Ideal Diode Bridge Controller
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LT4275A
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
schematic 6
DC2093A-A

LT4275A/LT4321 LTPoE++/PoE+/PoE PD Demo Board

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Product Details

DC2093A-A Demo Board for:
LT4275 LTPoE++/PoE+/PoE PD Controller
LT4321 PoE Ideal Diode Bridge Controller

eval board
schematic 7
schematic 8
schematic 9
schematic 10
schematic 11
schematic 12
DC2093A-B

LT4275B/LT4321 PoE+/PoE PD Demo Board

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Product Details

DC2093A-B Demo Board for:
LT4275 LTPoE++/PoE+/PoE PD Controller
LT4321 PoE Ideal Diode Bridge Controller

eval board
schematic 13
DC2093A-C

LT4275C/LT4321 PoE PD Demo Board

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Product Details

DC2093A-C Demo Board for:
LT4275 LTPoE++/PoE+/PoE PD Controller
LT4321 PoE Ideal Diode Bridge Controller

eval board
schematic 14
schematic 15
schematic 16
schematic 17
schematic 18
schematic 19
DC2125A

LT4275/LT4321/LTM8027 Demo Board | LTPoE++ PD Plus Diode Bridge and DC/DC Controller

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Product Details

Demonstration circuit 2125 is a small, highly-integrated, non-isolated PoE Powered Device (PD) solution. It features a PD Interface Controller (LT4275), which interfaces with a PoE Power Sourcing Equipment (PSE), an ideal diode bridge controller (LT4321), which minimizes bridge losses, and a DC/DC μModule® regulator (LTM8027).

eval board
schematic 20
schematic 21
schematic 22
schematic 23
AD-PS3803-RD

PoE+ with Ideal Diode Bridge to Isolated Flyback DC/DC (12V, 2A)

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Features and Benefits

  • Galvanically isolated 12V flyback DC output with up to 24 W of output power capability
  • No Transformer third winding or Opto-Isolator for output regulation
  • Supports IEEE802.3at (PoE+, Type 2) and IEEE802.3bt (PoE++, Type 3 and 4) interfacing and power supply control via a configurable jumper array
  • Supports a wide input DC auxiliary power of 37V to 57V

Product Details

The AD-PS3803-RD reference design is a power converter capable of harnessing any IEEE802.3at (PoE+, Type 2) compliant downstream Power-Over-Ethernet (PoE) supply to provide a galvanically isolated DC power.

At the core of this solution is the LT8306 60V No-Opto Flyback controller, stepping down the 37V to 57V PoE input voltage to a 12V, 24W DC output.

The on-board LT4275 LTPoE++/PoE+/PoE power delivery (PD) controller handles interfacing and power delivery to any PoE supply.

The LT4321 ideal diode bridge controller is used for improved end-to-end power delivery efficiency and eased thermal design by utilizing low RDS(ON) N-Channel FETs, replacing the eight-diode configuration typically found in passive PoE rectifier bridge.

The AD-PS3803-RD also has auxiliary DC power support for a wide input range of 37V to 57V.

APPLICATIONS

  • Industrial Automation
  • Surveillance Camera Systems
  • VoIP Phones
  • Payment Terminal Systems
  • Wireless Access Points
DC2093A-A
LT4275A/LT4321 LTPoE++/PoE+/PoE PD Demo Board
DC2093A-A Demo Board DC2093A-A Demo Board DC2093A-A Demo Board DC2093A-A Demo Board DC2093A-A Demo Board DC2093A-A - Schematic
DC2093A-B
LT4275B/LT4321 PoE+/PoE PD Demo Board
DC2093A-B Demo Board DC2093A-B Demo Board DC2093A-B Demo Board DC2093A-B Demo Board DC2093A-B Demo Board DC2093A-A - Schematic
DC2093A-C
LT4275C/LT4321 PoE PD Demo Board
DC2093A-A - Schematic
DC2125A
LT4275/LT4321/LTM8027 Demo Board | LTPoE++ PD Plus Diode Bridge and DC/DC Controller
DC2125A Demo Board DC2125A Demo Board DC2125A Demo Board DC2125A Demo Board DC2125A Demo Board DC2125A - Schematic
AD-PS3803-RD
PoE+ with Ideal Diode Bridge to Isolated Flyback DC/DC (12V, 2A)
AD-PS3803-RD Board Photo Angle View AD-PS3803-RD Board Photo Top View AD-PS3803-RD Board Photo Bottom View AD-PS3803-RD Block Diagram

Latest Discussions

1 Years Ago
RE: LT4275 POE controller no powergood
2 Years Ago
RE: LT4275 Voltage at AUX pin is less than the AUX threshold
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